Its because of the focus. Those Asians stress education more than anything. Kids go to school all day, then come home and their parents work with them some more. In some schools kids are preparing for middle and high school placement tests like we prepare for college finals, taking speed and all that.
Its not just a matter of getting better teachers here, we would have to totally change our mindset when it comes to child education. Over here we see having a balanced social life as part of a good education, that means participating in sports, music, etc.... Over there they dont give a shyt about that, its straight up grades.
Them Asians tend to go hard on anything they are interested in. Thats why they end up dying in internet cafe's playing WoW.